Sony CFD-21 - Section 5 Electrical Adjustment; Recorder Section

CFD-20/30
SECTION 4 SECTION 5
MECHANICAL
ADJUSTMENT
ELECTRICAL
ADJUSTMENT
PRECAUTION
5-1.
TAPE
RECORDER
SECTION
1.
Clean
the
following
parts
with
a
denatured-alcohol-
Note:
The
adjustment
should
be
performed
in
the
moistened
swab:
order
given
in
the
service
manual.
As
a
rule,
record/playback
head
pinch
roller
adjustment
about
playback
should
be
per-
erase
head
rubber
belts
formed
before
adjustment
about
recording.
capstan
idlers
The
adjustments
should
be
performed
for
both
2.
Demagnetize
the
record/playback
head
with
a
head
L-CH
and
R-CH.
demagnetizer.
(Do
not
bring
the
head
demagnetizer
close
Standard
Output
Level
to the erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound
Output terminal
load impedance
3 output signal level 0.25V (—10dB)
to
the
parts
adjusted.
maa
‘
j
0dB
=0.775V
5.
The
adjustments
should
be
perfomed
with
the
rated
[0aB
=0.775V
|
power supply voltage unless otherwise noted. Test Tape
6.
Power
supply
voltage:
9V
dc.
aoa
aoa
needa:
WS-48A 3kHz, 0dB tape speed adjustment
Torque
Measurement
P-4-A063
6.3kHz,
—10dB
azimuth
adjustment
Torque Torque meter Meter reading |
5 .
ss
Nee
come
é
30-756
°
om
Tape
Speed
Adjustment
ue ——— Procedure :
Forward
1.5—6g
*
cm
:
speed
checker
back
consid
€Q-102C
(0.020--0.083
oz
*
inch)
Mode:
playback
LFM-30
30—75g
*
;
or
€Q-102RC tire bog ine ae frequency
counter
R
1.5—6g
*
cm
back
tenciod
€Q-102RC
(0.020--0.083
oz
+
inch)
(3kHz,0¢B)
60—130g + cm
Fast
CQ-2018 (0.83—1.80 oz * inch)
Forward
eos 60—130g-cm
Rewind CQ-201B (0.83—1.80 oz « inch)
See ee:
\ | 3
PHONES jack
Adjustment Value:
Tape Tension Measurement (CFD-20
P 2 ( ) Speed checker Digital frequency counter
Mode
Meter
|
Meter
reading
|
“15%
to
+15%
2,955
to
3,045Hz
Forward
CQ-403A
|
more
than
150g
(more than 5.28 02)
Adjustment Location: Mechanism Deck block
—CFD-20— —CFD-30—
Tape Tension Measurement (CFD-30)
Mode Meter | Meter reading
Forward CQ-403A |
more than 90g
Reverse
CQ-403R
|
(more
than
3.16
0z)
tape speed
= | 0 a adjustment